Free pascal file time resolution drivers#
Free pascal file time resolution driver#
Free pascal file time resolution code#
Free pascal file time resolution windows#

Instead of creating the window and the renderer separately as demonstrated, you may use SDL_CreateWindowAndRenderer(width, height, window flags, window pointer pointer, renderer pointer pointer). If SDL_CreateWindowAndRenderer(500, 500, SDL_WINDOW_SHOWN, 0

Quick Creation of a Window and a Renderer // quick set up This automatically gives priority to hardware accelerated renderers. You may have noticed that none of these flags but 0 was used in the example code. SDL_RENDERER_TARGETTEXTURE allows for rendering to a texture. SDL_RENDERER_PRESENTVSYNC allows for so called vertical synchronization which means that the display of the rendered image is synchronized with the refresh rate of the monitor. As discussed before for best performance the graphic board is the best choice for rendering/graphic related tasks. You should always prefer SDL_RENDERER_ACCELERATED because this means the graphics board is responsible for rendering, SDL_RENDERER_SOFTWARE in contrast means, the CPU has to do the rendering. Talking about flags, there are four flags you may choose:

Free pascal file time resolution driver#

1 means that the first driver which is supporting the chosen flag(s) is chosen.

Free pascal file time resolution drivers#

Since we don’t know too much about the drivers at the moment the best choice is -1. In principle you could choose one specific driver here by choosing the corresponding index. OpenGL, Direct3d, Software,…) is indexed in SDL 2.0. Well, each driver which is capable of rendering (e.g. Next the shown function asks for a cryptic “index”.

The creation of the renderer is as simple as one function call of SDL_CreateRenderer(window, index, flags) or SDL_CreateRenderer(window: PSDL_Window index: SInt32 flags: UInt32): PSDL_Rendererįirst we need the renderer to know where to render the finished/rendered output. Creation of a Renderer sdlRenderer := SDL_CreateRenderer(sdlWindow1, -1, 0) The PSDL_Renderer (which we declared in the var clause) is responsible for synthesizing all the content in a window, be it some lines, a flat background, a texture, a 3d object, or whatever. To draw some content to the window, we need therefore a renderer. In computer graphics rendering means the process of synthesizing the final image on your screen from the individual basic data structures. For our purpose SDL_WINDOW_SHOWN is a good choice because we just create a shown window without any further restrictions. You may combine several flags by OR (if appropriate). SDL_WINDOW_FULLSCREEN will create a fullscreen window and SDL_WINDOW_BORDERLESS will create a borderless window. Window should be created in high-DPI mode if supported (available since SDL 2.0.1)Īs you can see, these flags determine different properties of the window. E.g. Flagįullscreen window at the current desktop resolution Look at the following table ( source) of possible flags and you may get an idea what they do. They decide for the properties of the window. The window is placed with respect to the left upper corner of the screen. This image by is licensed under a Creative Commons Attribution 4.0 International License. If you choose SDL_WINDOWPOS_UNDEFINED you don’t care for the window’s position. You may try SDL_WINDOWPOS_CENTERED for each or both coordinates which will lead to a centered window with respect of the screen. The diagram below may help to understand this. So if you choose (0/0) as coordinates the window’s left upper corner will be placed right at the left upper corner of your screen. The origin from where to count to place a window is always the left upper corner of your screen. First let’s get an understanding of the coordinate system in SDL2. And we have used the flag SDL_WINDOW_SHOWN. It has a width and height of 500 pixels respecitvly. In our example the window is titled “Window1”, it is located at position x = 50 and y = 50 pixels (relative to your screen). The creation of a SDL2 window is simple as using the function SDL_CreateWindow(title, x, y, width, height, flags) or more specific: SDL_CreateWindow(const title: PAnsiChar x: SInt32 y: SInt32 w: SInt32 h: SInt32 flags: UInt32): PSDL_Window size, appearance, border, title name and so on. We just need one window for now, let’s call it “sdlWindow1”.

Free pascal file time resolution windows#

In SDL 2.0 you can create as many windows as you like, and each window is adressed by its PSDL_Window variable. SdlRenderer: PSDL_Renderer The SDL2 Window Let’s have closer look at the var clause.

Free pascal file time resolution code#

The code to set up a window and a renderer is as follows. The window is the entity that is showing the graphic output and the renderer is the “machine” that is generating the output to be shown in the window. Every SDL2 program that shall show some graphic output has to have at least one SDL2 window and a SDL2 renderer.